Power supply circuit for backlight source

The invention discloses a power supply circuit for a backlight source, which is connected between a direct current power supply and the backlight source. The power supply circuit comprises a DC/DC digital-to-analogue conversion chip U1 and an accessory circuit, wherein the accessory circuit is conne...

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Bibliographische Detailangaben
1. Verfasser:	LUO YINXIANG
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS CONTROL OR REGULATION THEREOF CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING ELECTRICITY FREQUENCY-CHANGING GENERATION NON-LINEAR OPTICS OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL LOGIC ELEMENTS OPTICS PHYSICS TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF
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Beschreibung
Zusammenfassung:	The invention discloses a power supply circuit for a backlight source, which is connected between a direct current power supply and the backlight source. The power supply circuit comprises a DC/DC digital-to-analogue conversion chip U1 and an accessory circuit, wherein the accessory circuit is connected with the chip U1; an input end of the chip U1 is connected with the direct current power supply; and an output end of the chip U1 is connected with a positive electrode and a negative electrode of the backlight source. With the DC/DC digital-to-analogue conversion chip and a peripheral circuit thereof as the power supply circuit for the backlight source, automatic conversion is achieved through an oscillation frequency emitted by the DC/DC digital-to-analogue conversion chip; the conversion efficiency and quality are very high; and the circuit is simple, can be applied to constant-voltage power conversion and can also be applied to constant-current power conversion.